Emily Dickinson Lexicon

AL-CAID', n. [Sp. alcayde; Port. alcaide; Ar. قَايدٌ kaidon, with the prefix al, from قَادَ kada, to lead, rule, govern. Hence the Cadi of the Turks.]

Among the Moors, Spaniards and Portuguese, a governor. In Portugal, the chief civil magistrate of a town or city; also the jurisdiction of certain judges of appeal. In Spain, the governor of a castle or fort; also a jailer. – Span. and Port. Dict.